Calculate Your (BMR) Basal Metabolic Rate

The Basal Metabolic Rate (BMR) Calculator estimates your basal metabolic rate—the amount of energy
expended while at rest in a neutrally temperate environment, and in a post-absorptive state (meaning
that the digestive system is inactive, which requires about 12 hours of fasting). This calculator is
based on the Mifflin - St Jeor equation.

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Reference

The Basal Metabolic Rate (BMR) is the amount of energy you need while resting in a temperate environment
during the post-absorptive state, or when your digestive system is inactive. In such a state, your
energy will be used only to maintain your vital organs, which include the heart, lungs, kidneys, the
nervous system, intestines, liver, lungs, sex organs, muscles, and skin. The BMR decreases with age and
increases with muscle mass. The BMR is measured under very restrictive circumstances while awake. An
accurate BMR measurement requires that a person's sympathetic nervous system is inactive, which means
the person must be completely rested. Basal metabolism is usually the largest component of a person's
total caloric needs. The daily calorie needs is the BMR value multiplied by a factor with a value
between 1.2 and 1.9, depending on the activity level. In most situations, the BMR is estimated with
equations summarized from statistical data. The most commonly used one is the Mifflin - St Jeor
equation: